Xcode iPhone SDK - Keep NSInteger zero at beginning

Question

I want to keep the zero at the beginning of my NSInteger, but when i NSLog it, the zero is removed.

NSInteger myInteger = 05;
NSLog("%d", myInteger);

log: 5

I get 5 instead of 05. How can i keep the 0 at the beginning of the integer?

Answer 1

NSInteger doesn't do "leading" zeros. You're thinking about a number formatting thing.

If you just want to print out leading zeros via "NSLog", try something like:

NSLog( "%02d", myInteger);

Which instructs NSLog to have two digits and if it doesn't reach two digits, do a leading zero.

Take a look at the printf format specifiers (which NSLog tries to conform to) and you'll see how leading zeros are added there.

Answer 2

I am not sure, but I think it is a question of how you write your "%d" flag. So you cas use NSLog(@"%03d", var);.

It will print 005.

Answer 3

This is how it works for strings:

INT

String(format:"%05.2f", 5.0) will output: 05.00

DOUBLE

String(format:"%02d", 5) will output: 05

Answer 4

If you need it just for logging try it like this

NSLog(@"0%d" , 5) ;

or if you need to print it on the screen convert to string with format :

NSString *result = [[NSString alloc]initWithFormat:@"0%d" , yourInteger] ;